Heaving-plug.



C. J. REEVES.

HEAVING PLUG. I APPLICATION FILED APR. 15,1918.

Patented July 9, 1918.

5- czfieezzes 422mm (if/te m;

U 5 OJ 7 E 4 7 x 2 T E 6 5 E n mg? 6 WW I Q I (I 1H1 L 1| f i I HI| 1|HM 1 M /fl/ fl/ Z 9 9 canines J. annvas, or MABIGOlPA, CALIFORNIA.

HEAVING-PLUG.

Specification of Letters Patent.

Patented July 9, 1918.

Application filed April 15, 1918. Serial No. 228,68.

To all whom it may concern:

Be it known that I, CARLOS J. Rnnvns, a citizen of the United States, residing at Maricopa, in the county of Kern and State of California, have invented certain new and useful Improvements in I-Ieaving- Plugs, of which the following is a specification, reference being had to the accompanying drawings.

- This invention relates to certain improvements in heaving plugs and it is an object of the invention to provide a device of this general character having novel and improved means whereby the same when positioned within a well casing serves effectually to prevent debris and formation from heaving up into the pipe after the well, especially an oil well, is completed.

Another object of the invention is to provide a novel and improved plug of this type including gripping dogs adapted to frictionally engage the inner wall of a well casing whereby the plug is held against upward movement when in applied position.

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved heaving plug whereby certain important advantages are attained and the device rendered simpler, less expensive and otherwise more convenient and advantageous for use, as will be hereinafter more fully set forth.

The novel features of my invention will hereinafter be definitely claimed.

In order that my invention may be the better understood, I will now proceed to describe the same with reference to the accompanying drawings, wherein:

Figure 1 is a longitudinal sectional view of a plug constructed in accordance with an embodiment of my invention; and

Fig. 2 is a view in bottom plan of the device as illustrated in Fig. 1, with portions broken away.

As disclosed in the accompanying drawings 1 denotes a hollow cylindrical body or shell having its upper end 2 closed. The axial center of the closed end 2 is provided with an outstandin eye member 3 or the like with which a exible member or other element is adapted to be connected in order to lower the device within a well casing.

At diametrically opposed points the body or shell 1 is provided with the longitudi- Bally disposed slots through are directed the outer extremities of the clamping arms or dogs 5. The inner ends of the arms or dogs 5 are pivotally connected with the rod 6 disposed transversely through the body or shell 1 and supported thereby. The rod 6 occupies a horizontal plane at right angles to the plane in which is positioned the slots 4:.

The arms or dogs 5 are constantly urged toward the horizontal by an expansible member 7 herein disclosed as a coil. spring interposed between the inner or pivoted end portions of the arms or dogs 5 and the closed end portion 2 of the body or shell 1. The central portion of the end 2 is provided with an inwardly directed lug or finger 8 preferably formed integral with the end 2. The lug or finger 8 extends within the adjacent or outer end portion of the expansible member 7 and serves as a guide therefor to maintain the same in proper position.

The outer ends of the arms or dogs 5 are provided with the bevel teeth 9 which are adapted to have biting action upon the in ner wall of a well casing so that when in applied position the device is effectively held against upward movement within the casing under the influence of the debris and formation within the well. It is also to be noted that the bevel of the teeth 9 is such as to prevent the arms or dogs 5 from offering any obstruction to the device when the same is being lowered within the casing.

The arms or dogs 5 are loosely mounted upon the rod 6 and in order to maintain said arms or dogs 5 in substantially a fixed position upon the rod 6 I position upon the rod 6 at opposite sides thereof the spacing sleeves 11.

From the foregoing description, it is thought to be obvious that a heaving plug constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated and it will also be obvious that my invention is susceptible of some change and modifiaction without departing from the principles and spirit thereof and for this reason I do not wish to be understood as limiting myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in practice except as hereinafter claimed,

I laim;

1. A heaving plug comprising tubular body having one end closed and provided at substantially diametrically op osed points With openings, dogs eX'tendin-g' hrough said openings and pivotally engaged Withinthe body, and means Within the body for constantly ur 'ing the dogs in one direction.

' t 2L A heating 51mg comprising' a body provided With a chamber having openings in communication therewith, dogs extending ithin thebodythrough said openings and p'ivot ally supported" Within the chamber, and means Within the chamber for constantlyurgingthe dogs in one direction.

' "3. A heaving-plug comprising a.ho11oW body having an end closed, said closed end ,being' provided With an inwardly directed lug, the Walls of said bodybeing provided ith openings, dogs extending Within the bpdythr ongh the openings, means for pivotally supporting *the inner ends of the dogs, and a coil spring interposed between thclosed end of the body and bearing agai st thc pivoted end portion ofthe dogs fol-constantly urging the dogs 111' one direction,the lug o-I the closed end of the body extending Within an end portion of the spring.

CHAR DEL B NoIo, NELLIE LEAHY. 

